Sound-blocking sheet member, sound-blocking structure using same, and method for manufacturing sound-blocking sheet member

A resonator, comprising:

• a sheet;
• and
• at least one resonance portion,
• wherein the at least one resonance portion is provided in contact with a surface of the sheet,
• each at least one resonance portion includes a weight portion and a base portion,
• the weight portion is supported by the base portion and has a larger mass than the base portion, and
• the weight portion has a penetration portion.

A method for manufacturing a resonator having a sheet portion, at least one protrusion portion provided in the surface direction of the sheet portion, and a weight portion provided on a front end side of the at least one protrusion portion, the method comprising:

• a weight portion insertion step of inserting the weight portion into a bottom portion of at least one cavity, in which the at least one protrusion portion is to be molded, in a mold including the at least one cavity;
• and
• a resin insertion step of pouring a resin into the at least one cavity,
• wherein a projection portion is provided at one of the bottom portion and the front end side of the weight portion, and a recessed portion or a penetration portion into which the projection portion is to be inserted is provided at the other,
• wherein a projection portion is provided at the bottom portion of the at least one cavity, a recessed portion or a penetration portion into which the projection portion is to be inserted is provided at the weight portion,
• in the weight portion insertion step, the projection portion is inserted into the recessed portion or the penetration portion, and
• in the resin insertion step, in a state in which the projection portion is inserted into the recessed portion or the penetration portion and a position in the surface direction of the weight portion with respect to the bottom portion is regulated, the resin is poured into the at least one cavity.

A resonator, comprising:

• a sheet portion;
• at least one protrusion portion provided in the surface direction of the sheet portion and having a resin material;
• and
• a weight portion provided at an inside on the front end side of the at least one protrusion portion and having a recessed portion or a penetration portion on the front end side,
• wherein a void is formed on the inner side of the end surface on the front end side of the weight portion.